Around 50 million gallons of water flow from this spring every day.

An average of 33 million gallons of water pour out of the collapsed cave at the heart of this spherical spring.

When this test site was abandoned, they didn't even bother to take the rocket with them.

This secluded aqua waterfall in the Grand Canyon is the perfect swimming hole, and the Havasupai tribe's fiercely protected natural wonder.

A peaceful, unique botanical garden complete with waterfalls, mini islands, and swans.

The bizarre story of the mysterious death and hidden treasure of one of Sanibel Island's early homesteaders.

The walls of America's oldest masonry fort famously "swallowed" cannonballs.

Get up close with some alligators at this roadside farm attraction.

Mariners once used this prehistoric landfill as a navigational landmark.

The highway's southernmost spot is a beloved local attraction.

Hidden in the plaza next to a pizza shop is an amazing little oddities shop.

Though it may look like it’s missing its outer shell, this skeletal cast-iron tower was built to withstand wind and waves.

This abandoned bridge is now a favorite haunt for graffiti artists.

This former factory has been transformed into a technicolor wonderland, where dozens of local artists have collaborated to create a real choose-your-own-adventure experience.

This spooky road cut through a mound of ancient coral might be haunted by a witch.

Only through the lens of a microscope can visitors see the true treasures inside this museum.

In this small strip mall resides the largest collection of original art from the famed TV artist.

An oddity shop inspired by the history of the circus.

Six miles off the coast of Key West, a former military transport ship is now one of the largest artificial reefs in the world.

After a long career, a disastrous sinking, and a half-successful salvage, this Naval vessel-turned-artificial reef ended up exactly where she was supposed to—with a little help from nature.

An underwater city for the dead.

This naturally-sourced hot spring is now home to a clothing-optional resort.

A self-built castle made by a mysterious man.

Seemingly grown on some other world, these New Mexico rock formations look like a disused science fiction set.